//
// Copyright 2018-2020 Amazon.com,
// Inc. or its affiliates. All Rights Reserved.
//
// SPDX-License-Identifier: Apache-2.0
//

import os.log
import UIKit
import AppSyncRealTimeClient

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {

    func application(
        _ application: UIApplication,
        didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?
    ) -> Bool {
        // Override point for customization after application launch.

        // Initialize the subscription, don't do anything in particular with it
        _ = AppSyncRTCProvider.default

        return true
    }

    // MARK: UISceneSession Lifecycle

    func application(
        _ application: UIApplication,
        configurationForConnecting connectingSceneSession: UISceneSession,
        options: UIScene.ConnectionOptions
    ) -> UISceneConfiguration {
        // Called when a new scene session is being created.
        // Use this method to select a configuration to create the new scene with.
        return UISceneConfiguration(name: "Default Configuration", sessionRole: connectingSceneSession.role)
    }

    func application(
        _ application: UIApplication,
        didDiscardSceneSessions sceneSessions: Set<UISceneSession>
    ) {
        // Called when the user discards a scene session.
        // If any sessions were discarded while the application was not running, this will
        // be called shortly after application:didFinishLaunchingWithOptions.
        // Use this method to release any resources that were specific to the discarded
        // scenes, as they will not return.
    }

    func applicationWillResignActive(_ application: UIApplication) {
        OSLog.subscription.log("\(#function), unsubscribing", log: .subscription)
        AppSyncRTCProvider.default.unsubscribe()
    }

    func applicationDidEnterBackground(_ application: UIApplication) {
        OSLog.subscription.log("\(#function), unsubscribing", log: .subscription)
        AppSyncRTCProvider.default.unsubscribe()
    }

}
